Honing tool



P 1941- H. B. BARRETT- 2,254,508

HONING TOOL Filed Aug. 14, 1939 2 Sheets-Sheet l INVENTOR 4 ARRY B.BARRETT 167- 5 H H if?! 7 MM IG.4. ATTORNEY.

H. B. BARRETT HONING TOOL Sept. 2, 1941.

Filed Aug. 14. l939 ZSheets-Sheet 2 I INVENTOR HARRY B BARRETT ATTORNEY.

Patented Sept. 2, 1941 HONING TOOL Harry B. Barrett, St. Louis, Mo.,assignor to Barrett Equipment Company, St. Louis, Mo., a corporation ofMissouri Application August 14, 1939, Serial No. 290,039

' 12 Claims. (C

This invention relates generally to brake drum machining equipment and,more particularly, to a certain new and useful improvement in honingtools for smoothly finishing a machined drumsurface.

- My invention has for its primary objects the provision of a tool ofthe class mentioned which is simple, rugged, and economical inconstruction, which is durable, precise, and accurate in use, which isconveniently adaptable and adjustable for employment with various typesof drum lathes and to meet a wide range of drumdiameters, and which isexceedingly eflicient in quickly and speedily effecting an extremelysmooth shoe-engaging face to and upon the particular drum.

And with the above and other objects in view, my invention resides inthe novel features of form, construction, arrangement, and combinationof parts presently described and pointed out in the claims. 7

In the accompanying drawings (2 sheets)- Figure 1 is a perspective viewof a honing tool constructed in accordance with and embodying my presentinvention;

Figure 2 is a longitudinal sectional view of the tool;

Figure 3 is a plan view of the tool;

Figures 4 and 5 are transverse sectional views of the tool, takenapproximately along the lines 44, 5-5, respectively, Figure 2;

Figure 6 illustrates the tool in enlarged perspective in operativefinishing or honing position in a brake drum; and

Figures 7 and 8 are side elevational views of the tool, illustratingadjustments of the abrading carriers or blocks of the tool to meetdifferent drum diameters.

Referring now in more detail and by. reference characters to thedrawings,whichi1lustrate a preferred embodiment of the invention,,thetool comprises a body-member A preferably integrally including alengthwise somewhat arcuateior curved web I formed longitudinally at itsopposite ends with opposed recessed or concave-convex extensions 2, 2,providing hemi-cylindrical chambers ration best seen in Figure 1 andforming upon the upper face of the web I a longitudinally extendingchamber, as at a, for accommodating a suitably elongated plate-likemember 8 having the conformation in plan and section best seen in Figure2, the flanges. I being preferably re-enforcingly longitudinallyextended, as at Ia, over and along the opposite margins of the recessedarcuate extensions 2, 2', as shown.

Adjacent the extension 2, the flanges I are provided transversely withregistering openings, as at 9,,for mountingthe ends of a transverse pinIi] engaging the member 8 for securing the member 8 for hinged orswingablemovement within the chamber a and over the web I.

The member 8, as shown, is suitably sized and dimensioned for snuglyfitting for limited swingable movement withinthe chamber a and isprovidedat its one or hinged end with a'longitudinally projecting lip lI for impinging engagement with the abutment shoulder 6.

At its other or free end, the member 8 terminates at approximately thebase of the arcuate web-extension 2', and adjacent its said free end themember 8 is provided upon its outer or upper face with a transverselyextending-V-shaped recess, as at I2, and on its under face withpreferably a pair of relatively shallow recesses I3, I4, presentedtoward the upper face of the web I, the recesses or seats I3, I4, beingdisposed preferably equi-distantly on opposite sides of a transverselyextending re-enforcing or strengthening rib l5 located directly underthe recess i2, as best seen in Figure 2. Directly oppositte the seatsI3, I4, the web I is thickened or re-enforced, as at I6, and seated inthe recesses I3, I4, and impinging upon the thickened portion I 6 of theweb I, as best seen in Figure 2, is a pair of relatively heavycompression springs I! for normally yieldingly urging the free end ofthe member 8 outwardly and maintaining the lip l l in impinging relationupon the shoulder 6, all as also best seen in Figure 2 and for purposespresently more fully appearing.

Seated for axial rotatory movement in the pockets 3, 4, areapproximately hemi-cylindrical blocks B each threadedly provided with aretaining and adjustment member in the form of a headed screw I8projecting radially through, and for movement in, its accommodating slot5.

On its under or chordwise face, each block B is suitably provided,preferably as shown, with angular seats I), b, and adhesively orotherwise fixed in the respective seats b, b, and presented outwardlyfrom the respective block or carrier presented toward the face d of thedrum D to be finished. The screws I 8 are loosened and suite,

y shifted in the slots 5 for axially adju sting the blocks B so that therespective grindingfaces of the honing bars are brought approximately orsubstantially into flatwise engagement with the shoe-engaging drum-faced, the tool, asa

whole, extending across the' innerarea of the drum D more or less in thesegment of an arc. The lathe tool 0 is, then adjustably shifted towardthe drum-face d and into working engagement at its tip with the member 8at its recess lZ and isadvanced' so as to forc thefree end of the member8 slightly inwardly, thereby somewhat compressing the springs 11' andcushionwise maintaining the toolin operative working" relation to the.drum D, all as best seen in Figure 6.

The lathe C is nowset in rotation in the'conventional manner andworks'or shifts the; tool both circumferentially and transverselyover-"and across the drum-face d, which, by means of the so shifted bars20 and brushes I9, is rapidly smoothly finished and cleaned. e

As the honing or abrading operation proceeds; a certain amount of themetal of the drum D will be ground away and the-di'ameter' ofthedrumface d accordingly jincreased. Such diametrical increase, however,is automatically compensated for by the springs I], which yieldingly orelastically shift the body member' A and abrading-carriers B outwardlywith respect tothe' member 8 and retain'the'honing blocks "20 in abradinrelation' to and against the drum-face d, adjustment of the 'toolto meetsuch working' conditions being thus entirely 'elimin'atedl As will beatonce seen by reference to Figures 7 and 8, the tool may, bymereaxialrotation of the 'carriers B, be adjusted to-meet" a very wide rangeof difi'erent drum diameters, and it will be quite apparent that thehoningor abradingefficiency of the barsZO is maintained: by reason ofthe fact that the felt or cleaning pads 19 will continuouslyrem'oveandclear away oil, dust, grease, and other foreign particles fromthe drum-face (I being finished. With any reasonable and careful use, asenor honing ba'r's'Zt may be employed for effecting economically a'greatnum 'ber of successive finishing" operations, but, of course, aworns'et of honing bars 20 maybevery simply, quickly, and economicallyreplaced and renewedby simply removing a screw'lfl and sub stitutinganew carrier B. 7

It will thus be clear that, by my present in vention, there is provideda substantially uni versal honing tool, which maybe quicklya'nd readilyadjusted to meet a wide range of different drum diameters,'and which maybe conven iently and simply employed with practically all standard typesof drum 'l'athes; Actual use has demonstrated that'the tool will'in 'anexceed ingly short time remove all '-tool and chatter marks lfrom, andproduce a' super finish upon, the particular drum-face dg being' worked.7

It should be understood that changes and modifications in the form,construction, arrangement,

and combination of the several parts of the tool may be made andsubstituted for those herein shown and described'without departing fromthe nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

-means including a member hingedly attached to and upon the body-member,and a coiled spring interposed between said member and the bodymember. v

,2. A honing tool comprising a body-member having a web and parallelflanges projecting from the opposite margins of the web, abrading meansincluding honing bars disposed upon the body: member for finishingmovement upon the circumfer ential face of a brake drum, and means forengaging'said'bars with the drum face, said engaging means including amember disposed over said web and intermediate, and hingedly fastened atan end to, said flanges, and a coiled spring interposed between the weband the free end of said member. V i

3. A brake drum honing tool comprising a body-member having ahemi-Vcylindric'al chamher, a block seated for axial rotatory adjustmentin said chamber, and a honing bar carried by the block. p I 4.,A honingtool comprising an elongated oblong-rectangular body-member having ahemicylindrical chamber and a longitudinally extending slot in the wallof said chamber, a hemicylindrical block seated for rotatory adjustmentin said chamber, an adjustment member fixed to the block and shiftablein said slot, and an abrading bar carried by the block.

5. A honing tool comprising an elongated oblong-rectangular body-memberhaving longitudinally spaced transversely disposed hemicylindricalchambers and respective longitudinally extending slots in the walls ofsaid chambers, blocks seated for axial rotatory adjustinent in therespective chambers, adjustment members extending radially from theblocks and shiftable in. the respective slots, and abrading bars carriedby the blocks. Y

6. A brake-drum honing tool adapted for use in co operation with adrum-lathe, said tool comprising I an elongated. arcuate body-member,abrasivemeans adjustably mounted upon the bodyemember for optionallyfitting brake-drums of different diameters, a lathe-tool receiving armpivotally mounted on the body-member for limited swingable movement, andspring means for resiliently urging the arm away from the bodymember.

"7. A brake-drum honing tool adapted for use in co-operation.with a"drum-lathe, said tool comprising an elongated arcuate body-member,abrasive means adjustably mounted upon the body-member for optionallyfitting brake-drums of different diameters, an arm pivotally mountedonflthe body-member for limited swingable movement, said arm beingprovided in its outwardly presented face with a slotfor receiving theend of the drum lathe tool, and spring means for resiliently urging thearm away from the bodymember.

8. A honing tool comprising an elongated bodymember having a pluralityof transversely extending arcuate recesses, and a block rockably mountedin each recess and provided with upstanding abrasive and wiper membersdisposed in spaced parallel relation to each other.

9. A brake-drum honing tool for use with a drum-lathe comprising abody-member, abrasive means adjustably mounted upon the body-member foroptionally fitting brake drums of different diameters, an arm pivotallymounted on the body-member for limited swingable movement and adaptedfor supporting the tool in the lathe, and spring means for resilientlyurging the arm away from the body-member.

10. A brake-drum honing tool adapted for use in co-operation with adrum-lathe having a tool-holder, said tool comprising an elongatedarcuate body-member, abrasive means adjustably mounted upon thebody-member for optionally fitting brake drums of different diameters,an

arm pivotally mounted on the body-member for limited swingable movementand adapted for engagement with the tool-holder, and spring means forresiliency urging the arm away from the body-member.

11. A honing tool comprising an elongated oblong-rectangular body-memberhaving a hemicylindrical chamber, a block seated 'for axial rotatoryadjustment in said chamber, and an abrading bar carried by the block andtransversely disposed to the body-member.

1 2. A honing tool comprising an elongated oblong-rectangularbody-member having longitudinally spaced transversely disposedhemi-cylindrical chambers and respective longitudinally extending slotsin the walls of said chambers, blocks seated for axial rotatoryadjustment in the respective chambers, adjustment memhers extendingradially from the blocks and shiftable in the respective slots. abradingbars carried by the blocks, and means for yieldingly engaging said'barswith the surface being honed.

HARRY B. BARRETT.

